Sewing machine



Feb. 10, 1953 M. BUONO 2,627,828

SEWING MACHINE Filed March 1. 1951 s Sheets-Sheet 1 INVENTOR MAB/0 sun/v0 ATTORNEYS Feb. 10, 1953 M. BUONO 2,627,828

SEWING MACHINE Filed March 1, 1951 3 Sheets-Sheet 2' INVENTOR MAE/0 BUG/V0 ATTORNEYS Patented Feb. 10, 1953 SEWING MACHINE Mario Buono, New York, N. 1., assignor :to'U. S. Blind Stitch Machine Crp., New'York, N. 1., a corporation of New York Application March 1, 1951, Serial'No."213,'390

(Cl. ,l12--178) 6 Claims.

My invention relates to a. new and improved sewing machine.

One of the objects of my invention is to provide an improved sewing machine for providing two parallel and longitudinal lines of stitches. The work in which such two parallel and longitudinal lines of stitches are formed, consists optionally and preferably of a single layer in which oneof said lines of stitches is formed, and a multiple folded layerwhich has a fold in which or near which the other line of stitches is formed. This type of stitch is designated as a tacking stitch.

Another object of my invention is to form the stitches alternately or in other selected relation in said single layer and in or near said fold.

Another object of my invention is to provide a machine which has a work-support along which the work is fed longitudinally, a main rib which is turnably connected to said work-support, and an auxiliary rib. The main rib is oscillated and the auxiliary rib is also oscillated. The respective simultaneous strokes of said ribs are in respective reverse directions. These ribs are spaced laterally from each other and each rib has a lower nonstitch-forming position in which it does not present the respective part of the work to the needle, and each rib has an upper stitch-forming position in which it presents the respective part of the work to the needle. One rib is in its lower position when the other rib is in its upper position. While the invention is not limited to this type of sewing machine, such type is greatly preferred.

Another object .of my invention is to use the "main rib as drive "means to oscillate the auxiliary rib.

Another object of my invention is to form the stitches in said two rows, using a single transversely oscillating needle, and to skip or alternate the stitches in said two rows by reversely oscillating said ribs, without changing the position of the work-support.

Another object of my invention is to regulate the positions and depths of the stitches in one-of said :rows, .by regulating the top position of the auxiliary rib, without changing the position of the work-support.

Another object of my invention is to improve the-sewing machine which is disclosed in Buono U. S. Patent No. 1,926,644 dated September 12, 1933, and Buono U. S. Patent No. 2,108,100 dated February '15, 1938, and to provide a stitch which .is an improvement over the stitches disclosed in said patents.

The inventionis not limited to the above, and numerous additional objectsand features and advantages are stated :in the annexed description and drawings, which illustrate a preferred embodiment thereof. Without limitation thereto. the invention is illustrated in connection with a well-known-bype of blind-stitch sewing machine. whose essential parts are. described in said prior patents.

The stitches illustrated herein are 'blindstitches, but the stitches may be visible at a face of the work.

Fig. 1 is a side or longitudinal elevation of the blind-stitch sewing machine in which my improvements are incorporated, in this embodiment of my invention. In this view, the main rib I5 is shown in its top or stitch-forming position, and theauxili-ary rib I4 is shown in its lower or non- .stitch-iorming position, in which the respective stitch which corresponds to auxiliary rib I4 is skipped;

' Fig.2 is atop plan view, partially in horizontal section, on the line 2-2 of Fig. 1;;

Fig. 3 is a transverse section, partiallyin transverse elevation, on the line 3-3 of Fig. 1;

'Fig. 4 is a longitudinal section, partially in longitudinal elevation, on the lined-4 of Fig. 2.

"The main rib 1 5 is shown in broken lines in its tially in longitudinal elevation, which-shows the mechanism for oscillating the main rib 1:5 by power driven means. In this embodiment, there is one complete :oscillationoi the needle per two complete oscillations ioi't'he main rib 15, sothat stitches are alternately made andskipped at each of the ribs I'SJand l4;

Fig. 7 a transverse verticalsection, partially in transverse elevation. on the .line 1 of Fig. 1;

:Figs. .8 and 9 are respectively sections on the lines 8-.-.8 and 5-45 of Fig. 7,;

Fig. 10 is a'section on the line -lll--'l0 of Fig. 9; Fig. 11 is .aplan view on the line ll,-H of Fig. 12 is a transverse vertical section, partially in transverse elevation, on the line I2I2 of Fig. 1, showing main rib I5 in its upper, stitchforming position and showing auxiliary rib I4 in its lower, skip-stitch position;

Fig. 13 is similar to Fig. 12, showing the positions of the ribs reversed from the positions of Fig. 12;

Fig. 14 is a perspective view which shows the ribs and the means whereby the oscillation of main rib I5 simultaneously and reversely oscillates auxiliary rib I4; and,

Fig. 15 is a perspective view which shows the two longitudinal and parallel lines of stitches. These lines of stitches are parallel to the longitudinal direction which is parallel to arrow I2. The work is fed in said longitudinal direction.

Many of the parts illustrated herein are wellknown in the trade and are illustrated in said prior patents. The usual curved needle I is oscillated in opposed transverse strokes. Said needle i is fixed releasably to the usual needleholder 2, which is fixed to the usual longitudinal rock-shaft 3, which is oscillated by conventional means. The machine also has the usual head 4 and the usual looper 5 for forming the chain stitches of this type of sewing machine. The looper 5 is actuated by the conventional mechanism 6. The usual longitudinal feed-dog I operates longitudinally in a slot of the usual needleplate 8, which is fixed to the head 4 by the usual yoke 9.

Fig. 15 shows the work 0. This may be any kind of work, such as the work illustrated in said U. 8. Patent No. 2,108,100 issued February 15, 1938. For convenience of illustration, the work C is shown as consisting of a bottom layer III and a top folded layer I I, so that part of the work C consists of one ply or layer, and another part of the work consists of three plies or layers, during the sewing operation. Fig. 15 shows stitches A and B which are in two longitudinal and parallel and laterally spaced rows, which are parallel to the longitudinal direction which is indicated by or is parallel to arrow I2. In this embodiment the stitches A and B are chain stitches which are formed alternately. The work is fed in the longitudinal direction which is parallel to arrow I2.

The main rib or finger I forms a succession of bights Illa in the single bottom layer ID. The auxiliary rib I4 forms a succession of bights Ila in the work C, directly atthe fold in the two top layers of the work.

The main rib I5 is fixed to the transverse rockshaft II, which is turnably mounted in the worksupport 2'1. The work C is fed longitudinally while it rests upon the top surface of worksupport 21.

Fig. 6 shows the means for oscillating the transverse rock-shaft I! and the longitudinal main rib I5 which is fixed releasably and adjustably to rock-shaft II. The resilient arms of a yoke 25 are releasably and adjustably fixed to rock-shaft II by a clamping screw 26. An arm 23 is turnably connected to yoke 25 by a pivot 24. Said arm 23 has an eccentric strap or collar which surrounds and abuts the eccentric 22, which is fixed to driven shaft 2I. Said shaft 2| and its eccentric 22 are rotated by gears 20 and I9 and the main driving shaft I8. Gears I9 and 20 are fixed respectively to shafts I8 and 2|.

Fig. 6 shows the extreme positions of eccentric 22 in broken lines and in full lines, corresponding to the positions of pivot 24 which are shown respectively in broken lines and in full lines.

The arm 23 has a yoke 2311. which is clamped by a clamping screw to pivot 24, which is tumable in yoke 25.

In this embodiment, the pitch diameter of gear I9 is one-half the pitch diameter of gear 20. The needle I is given a complete transverse oscillation, which consists of a stitching stroke and a reverse stroke, for each complete revolution of shaft I8, and hence for each half-revolution of driven shaft 2I. This ratio may be different, such as one to three, one to four, etc.

In this specific embodiment, the longitudinal main rib I5 will form a respective stitch-forming bight I M, during alternate oscillations of the needle I, so that one stitch A is formed for each two oscillations of needle I.

The work-support 21 is not oscillated in this machine to produce skip-stitches. Said worksupport is connected to frame F by pivot 2810. As viewed in Fig. 6, the work-support 21 is biased to turn clockwise at pivot 28:), in order to elevate its top, longitudinal supporting surface which slidingly supports the work C. By turnably adjusting the work-support 27, the height of bight Illa can be regulated, thus regulating the depths of stitches A in layer C, and providing for an adjustment for cloth layers of different thicknesses. If the cloth is thin, the stitches will not be blind stitches.

The work-support 2'! is thus biased to turn clockwise as viewed in Fig. 6, by the usual longitudinal tension springs which are not shown. The longitudinal rod 29 is longitudinally adjustable in order to regulate the position of the top surface of work-support 21 relative to the transverse reciprocating movement of needle I. The longitudinal rod 29 is longitudinally slidable in a longitudinal guide opening of the frame F of the machine. A compression spring 30 biases rod 29 to move towards the left, as viewed in Fig. 6. One end of compression spring 30 abuts frame F. The

other end of compression spring 30 abuts a collar or head of adjusting rod 29.

One end of rod 29 abuts the transverse wall of work-support 21. The other end of rod 29 is connected by pivot 3| to lever 32, which is pivoted at pivot 33 to the frame F of the machine. The lever 32 and rod 29 are adjusted by knob 34, by means shown in said U. "S. Patent No. 1,926,644 dated September 12, 19,33.

The longitudinal auxiliary rib I4 has a body or shank I4a, as shown in Figs. 4, 5 and 14. As shown in Fig. 3 and Fig. 12, said body or shank I4a is connected by a pivot screw I6a, to one end of a transverse and non-turnable stud-shaft or rod I6. As shown in Fig. '7, this rod I6 is parallel to a stud-shaft or rod 35, which is non-turnable, and which is fixed to the frame F of the machine. As shown in Fig. 14, the shank of a transverse pin 28 is fixed to main rib I5. Said pin has a head 23a. The body or shank 14a of auxiliary rib I4 has a recess 21a, in which the shank of pin 28 is located. The rod I6 is located below the rockshaft II. Hence, when main rib I5 is turned counterclockwise as viewed in Fig. 4, its pin 28 and the recess 21a operate to turn auxiliary rib I4 clockwise around the axis of rod I6, so that main rib I5 is in its extreme upper end-position shown in Fig. 12, when auxiliary rib I4 is in its extreme lower end-position shown in Fig. 12. Similarly, when main rib I5 is turned clockwise as viewed in Fig. 4, it turns auxiliary rib I4 counterclockwise, so that auxiliary rib I4 is'inlts top position of Fig. "13 when main rib I5 is in its bottom position of Fig. 13. The bights Illa and "i la are thus alternately formed and the stitches A and B are alternately formed.

The depths of stitches B are regulated by regulatin the vertical position of rod I6. This also makes it possible to form the stitches B exactly at the inner fold of layer II, or along a selected line which is intermediate the inner fold of layer II and the fold between layers-I8 and H. The pin 28 is always spaced from the inner end of recess 21a.

'As shown in Fig. 8, a yoke 36 is turnably mounted on the non-turnable rod 35. The rod'35 extends through arms of said yoke 35, between which a collar 35a is located. This collar 35a consists of two parts which are assembled and fixed releasably to rod 35 by a clamping screw 35b. The

to. one end of a rod 42, which has an external thread which engages the internal thread of the tapped recess of bushing 53. One end of said bushing 43 has a head 44, which abuts an end of a boss 45 which is integral with work-support 27. The other end of said bushing .3 has an integral pin-extension 31, thus providing bushing 43 with a shoulder which abuts a spacer collar 45. The

pin 41 extends through collar :36 and is releasably fixed to collar 46 by a clamping screw 43.

Said pin 41 also extends through a knob .8, to

which pin 41 is releasably fixed by a clamping screw 50. The inner end of knob 49 has an enlarged flange 49a, which is located in a recess of work-support 27. Said flange 49a has a circular row of teeth 5| at the inner face of said flange. A ball detent 52 fits slidably in a recess of worksupport 21. A compression spring 53 biases ball detent 52 to engage the inner face of the flange 4911, between two respective teeth 5|.

As shown in Fig. 11, the outer face of flange tifia'has a scale,

and an index 21b for said scale is provided on work-support 21.

When the position of the work-support 27 is regulated by means of the adjusting rod 29, the

link 39 is raised or lowered, thus vertically adju'sting rod 56 relative to the rook-shaft ll.

When the top work-supporting surface of worksuport 2'! is lowered by means'of the adjusting rod 29, the rock-shaft I! is simultaneously lowered, because rock-shaft H is journalled in worksupport 21. Hence the relation between the top position of main rib l5'and the top work-supporting surface or work-support remains the same, and there is an adjustment between the top position of main rib I5 and the path of the needle i, so that the stitch A is closer to the top of layer ID. The lowering of the top surface of worksupport 2'! turns yoke 36 about the transverse axis of rod 35, thus raising rod l6, and moving the axis of oscillation of auxiliary rib l4 closer to pin 28, thus increasing the amplitude of the oscillation of auxiliary rib l4, and also raising the top position of the outer arcuate bight-forming surface of auxiliary rib l4, thus forming highwork-support 21, the rod I6 is lowered relative to rock-shaft l1. However, the main adjustment of auxiliary rib I4 relative to the work-support 21 is done by turning knob 49, thus raising or lowering rod l6 relative to rock-shaft H.

The Work C is supported on the usual fingers 51 at the feed-dog 1 and adjacent the transverse path of the needle I. These fingers 51 are pivoted to the usual arms 58, and the usual torsion springs are provided at the pivots between fingers 51 and arms 58. The arms 58 are pivoted by respective pivots 56 to work-support 21, and said arms 58 have the usual integral extensions 55 whichware biased by the usual tension springs 54 against the well-known adjustablestops. These parts are well-known and are illustrated in said prior patents.

The outer bight-forming surface of main'rib I5 is optionally and preferably concentric with the axis of rock-shaft I1, although the radius-of said surface may increase or decrease between its ends. This applies to the outer bight-formin'g surface of auxiliary rib l4.

The pin 28 optionally and preferably always remains spaced from the inner end of recess 21a.

The zig-zag or skip tacking stitches are particularly useful in tacking cloth whichis impregnated or coated with plastic, and other types of cloth which are very smooth and have a'very low coefficient of friction.

It is well-known to provide stitch-forming bights in the work by means of vertically reciprocating plungers and other bight-forming means, which require no description. In its broadest aspect, the invention is not limited to the night-forming means disclosed herein,- but such bight-forming means are greatly preferred.

In one aspect of the invention, it isembodied in a sewing machine of the type in which a needle is moved to-and-fro in a needle-path which is lateral or transverse to the direction of feed of the work. Said machine optionally and preferably has a frame to which a mount for a first bight-forming member is connected. This mount is exemplified by work-support 21 and said first bight-forming member is exemplified by main rib l5. This first bight-forming member is movable to-and-fro or otherwise relative to theframe, to respective operating bight-forming positions and non-operating non-bight-forming positions. Said first bight-forming member may be assembled movably with said frame in any manner, so that the invention is not limited to the use of a mount for said first bight-forming member. The machine has a second bight-forming member which is exemplified by auxiliary rib M. The first and second bight-forming members 'are spaced laterally or transversely relative to each other, in order to form respective stitches which are spaced laterally or transversely relative to each other. There are stitch-forming periods in which only one of said bight-forming members'is in bight-forming position. Optionally and preferably, one of said bight-forming members operates the other bight-forming member, and said bight-forming members are simultaneously operated in opposed strokes in order to produce zigzag stitches, which may be tacking stitches.

As previously noted, the invention includes a sewing machine which forms lock-stitches or any other kind of stitch, although chain stitches are greatly preferred.

In one broad aspect of the invention, it is not limited to the use of two bight-forming members which are movable vertically or transversely relative to the feed-path, and which are spaced from each other to a direction which is lateral or horizontal relative to said feed path. It is sufficient if the automatic operating mechanism for said bight-forming members keeps at least one bight-forming member out of bight-forming position while at least one of said bight-forming members is kept out of bight-forming position.

A preferred embodiment of the invention has been disclosed, but numerous changes and omissions and additions and substitutions can be made without departing from its scope.

I claim:

1. In a sewing machine of the type which has a frame and a work-support which is pivoted to said frame and feed-mean which operate in a selected longitudinal feed-path and a needle which is moved to-and-fro in a selected needlepath which is transverse relative to said feedpath, said work-support having a top-surface which is provided with an opening, a main rib which is turnably connected to said work-support below said top-surface, said main rib being turnable about a transverse axis relative to said worksupport, automatic operating means for oscillating said main rib around said transverse axis to a bight-forming position in which said main rib extends through and above said opening and to a lower non-bight-forming position, an auxiliary rib which is turnably connected to said frame, said auxiliary rib being turn-able relative to said frame and relative to said main rib about a transverse axis and being spaced transversely from said first rib, said auxiliary rib being turnable about its transverse axis to a bight-forming position in which said auxiliary rib extends through and above said opening and to a lower non-bight-forming position, Said main rib having andoperating drive means which are connected to said auxiliary rib, said drive means osoillating said auxiliary rib reversely to said main rib.

2. In a sewing machine of the type which has a frame and a work-support which is pivoted to said frame and feed-means which operate in a selected longitudinal feed-path and a needle which is moved to-and-fro in a selected needlepath which is transverse relative to said feedpath, said work-support having a top-surface which is provided with an opening, a main rib which is turnably connected to said work-support below said top-surface, said main rib being turnable about a transverse axis relative to said work-support, automatic operating means for oscillating said main rib around said transverse axis to a bight-forming position in which said main rib extends through and above said opening and to a lower non-bight-forming position, an auxiliary rib which is turnably connected to said frame, said auxiliary rib being turnable relative to said frame and relative to said main rib about a transverse axis and being spaced transversely from said first rib, said auxiliary rib being turnable about its transverse axis to a bightforming position in which said auxiliary rib extends through and above said opening and to a lower non-bight-forming position, said main rib having and operating drive means for oscillating said auxiliary rib, said drive means oscillating said auxiliary rib reversely to said main rib, said drive means comprising a transverse pin which is fixed to said main rib, said auxiliary rib having a recess in which said pin is located.

3. In a sewing machine of the type which has a frame and a work-support which is pivoted to said frame and feed-means which operate in a selected longitudinal feed-path and a needle which is moved to-and-fro in a selected needlepath which is transverse relative to said feedpath, said work-support having a top-surface which is provided with an opening, a main rib which is turnably connected to said work-support below said top-surface, said main rib being turnable about a transverse axis relative to said worksupport, automatic operating means for oscillating said main rib around said transverse axis to a bight-forming position in which said main rib extends through and above said opening and to a lower non-bight-forming position, an auxiliary rib which is turnably connected to said frame, said auxiliary rib being turnable relative to said frame and relative to said main rib about a transverse axis and being spaced transversely from said first rib, said auxiliary rib being turnable about its transverse axis to a bight-forming position in which said auxiliary rib extends through and above said opening and to a lower non-bight-forming position, said main rib having an operating means for oscillating said auxiliary rib, said drive means oscillating said auxiliary rib reversely to said main rib, said connecting drive means comprising a transverse pin which is fixed to said main rib, said auxiliary rib having a recess in which said pin is located, said transverse axis of said auxiliary rib being lower than said transverse axis of said main rib.

4. In a sewing machine of the chain-stitch type which has a frame and a drive shaft and a worksupport which is pivoted to said frame and in which said work-support has a top work-supporting surface and in which the machine has a feed-dog which is operated in a longitudinal feedpath and in which said machine has a curved needle which is oscillated in a needle-path transversely relative to said feed-path and said machine has a looper which cooperates with said needle to form a succession of chain stitches, said work-supporting surface having a top opening, a longitudinal main rib, a transverse rock-shaft to which said main rib is fixed, said rock-shaf t being journaled in said pivoted work-support below said work-supporting surface, a longitudinal auxiliary rib which is turnable relative to said main rib and which is spaced from said main rib in a direction which is lateral relative to said feed-path, a lateral transverse rod on which said auxiliary rib is turnably mounted, said transverse rod being spaced transversely from said rock-shaft and being connected to said work-support, regulating means for regulating the position of said worksupporting surface vertically relative to said needle-path, said needle-path being transversely above said work-supporting surface, connecting means between said drive shaft and said rockshaft to oscillate said rock-shaft, drive means fixed to said main rib and connected to said auxiliary rib to oscillate said auxiliary rib, each said rib being turnable in a respective bight-forming forward stroke to a bight-forming position in which said rib extends through and transversely above said opening, each said rib being turnable in a reverse stroke below said opening out of its said bight-forming position, said drive means being adapted to turn said auxiliary rib in its reverse stroke when said main rib is turned in its forward stroke and to turn said auxiliary rib in its forward stroke when said main rib is turned in its reverse stroke, and additional regulating means movably mounted on said work-support and adapted to regulate the transverse spacing between said rock-shaft and said rod.

5. In a sewing machine of the chain-stitch type which has a frame and a drive shaft and a worksupport which is pivoted to said frame and in which said work-support has a top work-supporting surface and in which the machine has a feed-dog which is operated in a longitudinal feedpath and in which said machine has a curved needle which is oscillated in a needle-path transversely relative to said feed-path and said machine has a looper which cooperates with said needle to form a succession of chain stitches, said work-support surface having a top opening, a longitudinal main rib, a transverse rock-shaft to which said main rib is fixed, said rock-shaft being journaled in said pivoted work-support below said work-supporting surface, a longitudinal auxiliary rib which is turnable relative to said main rib and which is spaced from said main rib in a, direction which is lateral relative to said feed-path, a lateral transverse rod on which said auixilary rib is turnably mounted, said lateral rod being spaced transversely from said rock-shaft and being connected to said work-support, regulating means for regulating the position of said worksupporting surface transversely relative to said needle-path being transversely above said worksupporting surface, connecting means between said drive shaft and said rock-shaft to oscillate said rock-shaft, drive means fixed to said main rib and adapted to oscillate said auxiliary rib, each said rib being turnable in a respective bightforming forward stroke to a bight-forming position in which said rib extends through and above said opening, each said rib being turnable in a reverse stroke out of its said bight-forming position to a non-bight-forming position below said opening, said drive means being adapted to turn said auxiliary rib in its reverse stroke when said main rib is turned in its forward stroke and to turn said auxiliary rib in its forward stroke when said main rib is turned in its reverse stroke, and

additional regulating means movably mounted on said work-support and adapted to regulate the transverse spacing between said rock-shaft and said rod, said drive means being a drive pin which is fixed to said main rib, said auxiliary rib having a recess through which said drive pin extends, said transverse rod being below said rock-shaft.

6. In a sewing machine of the type which has a frame and a work-support and feed-means which operate in a selected longitudinal feedpath to feed the work along the top surface of said work-support and a needle which is moved to-and-fro above said top surface in a selected needle-path which is transverse relative to said feed-path, said machine having a transverse rockshaft which is located below said top surface, means for oscillating said rock-shaft, a first rib fixed to said rock-shaft, a second rib which is turnably mounted on a second rib-axis which is parallel to and which is spaced transversely from the axis of said rock-shaft, and drive means operated by said rock-shaft and adapted and operative to turn said second rib simultaneously with said first rib and in a direction opposed to the direction of turning of said first rib, each said rib being turnable to a bight-forming position and to a non-bight-forming position, said drive means turning said second rib to its non-bightforming position when said rock-shaft turns said first rib to bight-forming position, said drive means turning said second rib to its bight-forming position when said rock-shaft turns said first rib to non-bight-forming position.

MARIO BUONO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,108,100 Buono Feb, 15, 1938 2,440,811 Schifter et a1. May 4, 1948 

